<template>
  <view>
    <!-- 搜索框 -->
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none">搜索</uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clear"></uni-icons>
      </view>
      <view class="history-list">
        <uni-tag v-for="(item,i) in historys" :key="i" :text="item" @click="gotogoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        keyword:'',
       searchResults: [], // 搜索结果列表
       historyList:[]
      }
    },
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    computed: {
      historys() {
        // 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
        // 而是应该新建一个内存无关的数组，再进行 reverse 反转
        return [...this.historyList].reverse()
      }
    },
    methods:{
      input(e){
      clearTimeout(this.timer)
      this.timer = setTimeout(()=> {
        this.keyword = e
         this.getsearchResults()
      },1000)  
      },
      async getsearchResults(){
      if(this.keyword.length === 0){
        this.searchResults = []
        return
      }
      const  {data} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.keyword})
      if(data.meta.status !==200) return uni.$showMsg()
      this.searchResults = data.message
      this.saveSearchHistory()
      },
      gotoDetail(id){
        uni.navigateTo({
           // 指定详情页面的 URL 地址，并传递 goods_id 参数
           url: '/subpkg/goods-detail/goods-detail?goods_id=' + id
        })
      },
      saveSearchHistory(){
        const set = new Set(this.historyList)
        set.delete(this.keyword)
        set.add(this.keyword)
        this.historyList = Array.from(set)
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      // 清空历史记录和本地存储
      clear(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      // 跳转传参
      gotogoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top:0;
  z-index: 999;
}
.sugg-list {
  padding: 0 5px;

  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;

    .goods-name {
      // 文字不允许换行（单行文本）
      white-space: nowrap;
      // 溢出部分隐藏
      overflow: hidden;
      // 文本溢出后，使用 ... 代替
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
      background-color: teal;
    }
  }
}
</style>
